Harperdog writes: "MIT came out with a press release yesterday (http://web.mit.edu/newsoffice/2012/prolonged-radiation-exposure-0515.html) claiming that low-level, prolonged exposure to radiation poses little risk to DNA. However, severe problems seem to exist with their data, including the fact that one study they cite (Muirhead 2009) contradicts their conclusion. Their study also relied on experiments with mice, while the epidemiological studies in the Bulletin of the Atomic Scientists' Radiation Issue relied on humans, and a great many more of them. This link is to the Bulletin's Table of Contents; access is free for another week or so."Link to Original Source